[3] He then studied modern history at Christ Church, Oxford,[4] and he graduated with a Bachelor of Arts (BA) degree in 1951:[5] as per tradition, his BA degree was promoted to a Master of Arts (MA Oxon) in 1955.

[1][5] During this time, he also studied theology at Christ Church, Oxford, completing a Bachelor of Letters (BLitt) degree in 1956.

[5] Due to his reputation as a theologian and for his involvement in Anglican-Orthodox relations, Allchin was awarded a number of honorary Doctor of Divinity (DD) degrees; by the Bucharest Theological Institute[which?]

[5] From 1956 to 1960, he served his curacy at St Mary Abbots, Kensington in the Diocese of London.

[6][5] During this time, he also acted as an adviser to Michael Ramsey, the then Archbishop of Canturbury, on Anglican relations with the Eastern Orthodox Church.

[3] In 1987, Allchin left Canterbury Cathedral to become programme director of the St Theosevia Centre for Christian Spirituality in Oxford.

[6] A Requiem Mass was held for him on 12 January 2011 at St Mary Magdalen's Church, Oxford.